CN207732573U - A kind of motor for eliminating bearing galvano-cautery - Google Patents
A kind of motor for eliminating bearing galvano-cautery Download PDFInfo
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- CN207732573U CN207732573U CN201721588314.3U CN201721588314U CN207732573U CN 207732573 U CN207732573 U CN 207732573U CN 201721588314 U CN201721588314 U CN 201721588314U CN 207732573 U CN207732573 U CN 207732573U
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Abstract
The utility model discloses a kind of motors for eliminating bearing galvano-cautery, motor stator, rotor including shell and its inside, shaft, shell both ends are separately installed with first end cover and second end cover, described shaft one end is pierced by first end cover by first bearing adaptation, the shaft other end is adapted to by second bearing with second end cover, the second end cover external stability has cover board, the end face of the shaft other end is also at electrical communication state with second end cover by elastic parts and cover board electrical communication, the cover board with shell, first end cover.The elastic parts includes thimble, spring and syringe, and the second end cover external stability has cover board, described syringe one end to be fixed with cover board, and spring is positioned in syringe, and thimble one end is stretched into syringe and touched with spring interface, and the thimble other end is in contact with shaft end face.The utility model is versatile, installation is simple, at low cost, long lifespan, structure is reliable, maintenance cost is low.
Description
Technical field
The utility model is related to motor field, more particularly to a kind of motor for eliminating bearing galvano-cautery.
Background technology
It is not no shaft voltage when the three phase electric machine operation of theoretical ideal balance.But since electricity can not be made in the manufacturing
Machine three-phase perfectly balances, can not be perfectly balanced between three-phase, to form alternating magnetic field inside motor.Metal is in alternation magnetic
Electromotive force is just will produce in.The machine shaft of metal material will turn in the motor internal operations with alternating magnetic field
Electromotive force is formed on axis.
Electromotive force in shaft needs to be formed into a loop by conductor, and motor upper bearing (metal) just assumes responsibility for the angle of conductor in circuit
Color.But common bearing is at runtime, there is the insulation oil film of about 3 microns (μm) between bearing internal external circle and bearing roller, causes and turns
Charge is accumulative on axis.Enough charges are accumulative to form sufficiently large electromotive force, and sufficiently large electromotive force can puncture 3 microns
Insulation oil film.
This breakdown model punctures similar to capacitance, and bearing roller and inner and outer ring raceway have respectively constituted the two poles of the earth of capacitance.Root
According to capacitance equation Q=It.When capacitance charge Q accumulates to a certain extent, the disruptive discharge time, t was shorter, punctured the electric current I of generation
It is bigger.Breakdown current is big, and the raceway position transient melting for causing bearing roller and roller contact to arrive is rolled in bearing movable
Son adherency is carried away to raceway other positions, and then high-visible galvano-cautery lines is formd in raceway.
Solving bearing galvano-cautery, there are two types of theoretical schemes：A. reduce the uneven magnetic field for generating shaft current, to reduce axis
The generation of electric current；B. the shaft current of generation is not allowed to pass through bearing.
Three kinds of methods below generally use avoid the generation of shaft current at present：I) magnet ring absorption pattern；Ii) bearing insulation side
Formula；Iii) bearing internal external circle getting type.
Scheme i) is typically used in wind-powered electricity generation, in large scale industry motor.Scheme ii) there are ceramic insulation bearing and patent document
《A kind of suppressing method of motor bearings shaft current》(publication number：CN105811638A bearing chamber interior insulation mentioned in) etc..Side
Case iii) it is typically used in large scale industry brush motor.
There is not the bearing galvano-cautery removing method that can be applied in permanent magnet synchronous motor also currently on the market, it may be considered that
It is realized, but had the following problems using the method that ceramic insulation bearing and bearing chamber insulate：
1. the price of ceramic insulation bearing is the decades of times of same specification plain bearing, cost is too high, far beyond product
Using the price that can be born.
2. patent document《A kind of suppressing method of motor bearings shaft current》(publication number：CN105811638A) middle (center) bearing
Indoor insulating layer requires 0.4~0.6mm of plating Teflon coating thick.A) with current common process coating usually only 0.02~
0.1mm realizes that difficulty is big.B) bearing chamber of assembly bearing coordinates required precision H6, such asThickness of coating 0.4
~0.6mm cannot be satisfied class fit high in this way, cause bearing and bearing chamber fit clearance excessive, bearing is in high-speed cruising
When skid inside bearing chamber, can cause 1. bearing act as a travelling agent circle, service life reduction；The circle 2. bearing is acted as a travelling agent, scrapes bearing chamber, and coating is scraped
Fall to fail.
Utility model content
The utility model aim is：A kind of motor for eliminating bearing galvano-cautery is provided, solves motor bearings by galvano-cautery
The problems such as risk and prior art commercial Application technique are difficult, and application cost is high, and versatility is low, reaches easy to implement in technique, more
Platform compatibility is strong.
The utility model from solve galvano-cautery theoretical scheme be：Do not allow the shaft current of generation by bearing, to reach
Bearing is protected, bearing galvano-cautery is avoided.
Bearing galvano-cautery has following 3 kinds of current loops.1) inside electric current is formed by bearing between machine shaft and shell
Electric discharge；2) electric current is by forming ground connection electric discharge between shell and earth point；3) electric current is formed on bearing and is sparked.
After all, bearing galvano-cautery is because there are potential differences between shaft and shell.If can will be between shaft and shell
Potential difference elimination can avoid bearing galvano-cautery.The utility model ties the machinery by special designing between shaft and shell
Structure is connected, and achievees the effect that equipotential between shaft and shell, to eliminate the risk of bearing galvano-cautery.
The technical solution of the utility model is：
A kind of motor for eliminating bearing galvano-cautery, including shell and its motor stator of inside, rotor, shaft, shell
Body both ends are separately installed with first end cover and second end cover, and described shaft one end is pierced by first end cover by first bearing adaptation,
The shaft other end is adapted to by second bearing with second end cover, and the second end cover external stability has cover board, the shaft another
The end face at end is also at electrically by elastic parts and cover board electrical communication, the cover board with second end cover, shell, first end cover
On-state.
Preferably, the elastic parts includes thimble, spring and syringe, and the second end cover external stability has cover board, institute
It states syringe one end to fix with cover board, spring is positioned in syringe, and thimble one end is stretched into syringe and touched with spring interface, and thimble is another
End is in contact with shaft end face.
Preferably, the shaft end face being in contact with thimble is equipped with centre bore, and the thimble is inserted into roller end centre bore
It is interior.
Preferably, the shaft end face being in contact with thimble is machined with boss, and the thimble is radially contacted with boss.
Preferably, the elastic parts includes a spring leaf, described spring leaf one end is in contact with cover board, the other end and
Shaft end face is in contact.
The advantages of the utility model, has：
1. versatile.As long as shaft can be with design centre hole, and shaft end has arrangement space, so that it may to use.
2. installation is simple.Mechanism can be pre-installed on cover board, then can be installed with cover board.
3. at low cost.Part can be processed by standard component in motion mechanism, and the usual outer diameter of motion thimble is not more than φ 5, always
Cost is suitable with an equal amount of two bolt costs.
4. long lifespan.Thimble is contacted with the axle end center hole of shaft, and the friction and wear between thimble and shaft is reduced to
It is minimum.
5. structure is reliable.It is connected using spring, thimble position and compensation wear extent can be automatically adjusted so that thimble and shaft
Always all in contact condition.
6. maintenance cost is low.Even if only needing to tear cover board open if replacing thimble, without dismantling other component again, so that it may
It is easy to operate to replace.
Description of the drawings
The utility model is further described with reference to the accompanying drawings and embodiments：
Fig. 1 is the structural schematic diagram of the motor of the elimination bearing galvano-cautery of the utility model embodiment 1；
Fig. 2 is the structural schematic diagram of the elastic parts of embodiment 1；
Fig. 3 is the structural schematic diagram of the elastic parts of embodiment 2；
Fig. 4 is the structural schematic diagram of the elastic parts of embodiment 3.
Specific implementation mode
Embodiment 1
As shown in Figure 1, the motor described in the utility model for eliminating bearing galvano-cautery, including shell 1 and its electricity of inside
Machine stator 6, rotor 5, shaft 3, shell both ends are separately installed with first end cover 2 and second end cover 7,3 one end of the shaft
It is pierced by first end cover 2 by the adaptation of first bearing 4,3 other end of shaft is adapted to by second bearing 9 with second end cover 7, described
7 external stability of second end cover has cover board 8, the end face of the shaft other end to pass through elastic parts 10 and 8 electrical communication of cover board.
As described in Figure 2, the elastic parts 10 includes thimble 10-1, spring 10-2 and syringe 10-3, the syringe 10-3
One end is fixed with cover board 8, and spring 10-2 is positioned in syringe 10-3, and thimble 10-1 is stretched into one end in syringe 10-3 and spring 10-2
It is in contact, the thimble 10-1 other ends are in contact with 3 end face of shaft.3 end face of shaft being in contact with thimble 10-1 is equipped with centre bore,
The thimble 10-1 is inserted into roller end centre bore.Shaft 3 is electrically connect by thimble 10-1 through spring 10-2 and syringe 10-3
It is logical, syringe 10-3 and cover board 8, second end cover 7, shell 1, first end cover 2 etc. all in electrical communication state, therefore shaft 3 and
Shell 1, second end cover 7 and first end cover 2 are also at electrical communication, have also just reached the effect of equipotential between shaft 3 and shell 1
Fruit.
In the present embodiment, thimble 10-1 is contacted with the centre bore of shaft 3, since the linear velocity of shaft central hole is approximately equal to
Friction and wear between thimble 10-1 and shaft 3 is reduced to minimum by 0m/s.
In the present embodiment, the contact between thimble 10-1 and shaft 3 is pre-tightened using 10-2 springs.One side different operating shape
The length of state lower rotary shaft temperature real-time change, shaft 3 also has minor change, and spring 10-2 can adjust the positions thimble 10-1,
To reach thimble 10-1 with shaft 3 always all in contact condition.It on the other hand, can be with when thimble 10-1 is worn
The length for compensating thimble 10-1, to remain to make thimble 10-1 with shaft 3 always all in contact condition.
Embodiment 2
As shown in figure 3, the elastic parts 10 of the present embodiment also includes thimble 10-1, spring 10-2 and syringe 10-3, with reality
Apply unlike example 1, the shaft end face being in contact with thimble 10-1 is machined with the boss 10-4 of minimum outer diameter, the thimble with it is convex
Platform radially contacts with.
Embodiment 3
As shown in figure 4, the elastic parts 10 of the present embodiment uses the one end spring leaf 10-5, the spring leaf 10-5
It is in contact with cover board 8, the other end is in contact with 3 end face of shaft.Angle α between spring leaf 10-5 and cover board 8, before cover board installation
Bigger than after installation, suitable with Examples 1 and 2 principle, spring leaf can equally adjust, and compensate the variation of position.
Above-described embodiment is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
People can understand the content of the utility model and implement according to this, the scope of protection of the utility model can not be limited with this.It is all
According to the modification that the Spirit Essence of the utility model main technical schemes is done, should all cover in the scope of protection of the utility model
Within.
Claims (5)
1. a kind of motor for eliminating bearing galvano-cautery, including shell and its motor stator of inside, rotor, shaft, shell
Both ends are separately installed with first end cover and second end cover, and described shaft one end is pierced by first end cover by first bearing adaptation, turns
The axis other end is adapted to by second bearing with second end cover, it is characterised in that：The second end cover external stability has cover board, described
The end face of the shaft other end is by elastic parts and cover board electrical communication, the cover board and second end cover, shell, first end cover
In electrical communication state.
2. the motor according to claim 1 for eliminating bearing galvano-cautery, it is characterised in that：The elastic parts includes top
Needle, spring and syringe, the second end cover external stability have cover board, described syringe one end to be fixed with cover board, and spring is positioned over needle
In cylinder, thimble one end is stretched into syringe and is touched with spring interface, and the thimble other end is in contact with shaft end face.
3. the motor according to claim 2 for eliminating bearing galvano-cautery, it is characterised in that：The shaft end being in contact with thimble
Face is equipped with centre bore, and the thimble is inserted into roller end centre bore.
4. the motor according to claim 2 for eliminating bearing galvano-cautery, it is characterised in that：The shaft end being in contact with thimble
Face is machined with boss, and the thimble is radially contacted with boss.
5. the motor according to claim 1 for eliminating bearing galvano-cautery, it is characterised in that：The elastic parts includes one
Spring leaf, described spring leaf one end is in contact with cover board, the other end is in contact with shaft end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721588314.3U CN207732573U (en) | 2017-11-24 | 2017-11-24 | A kind of motor for eliminating bearing galvano-cautery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721588314.3U CN207732573U (en) | 2017-11-24 | 2017-11-24 | A kind of motor for eliminating bearing galvano-cautery |
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| Publication Number | Publication Date |
|---|---|
| CN207732573U true CN207732573U (en) | 2018-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721588314.3U Active CN207732573U (en) | 2017-11-24 | 2017-11-24 | A kind of motor for eliminating bearing galvano-cautery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681836A (en) * | 2017-11-24 | 2018-02-09 | 合肥巨动力系统有限公司 | A kind of motor for eliminating bearing galvano-cautery |
-
2017
- 2017-11-24 CN CN201721588314.3U patent/CN207732573U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681836A (en) * | 2017-11-24 | 2018-02-09 | 合肥巨动力系统有限公司 | A kind of motor for eliminating bearing galvano-cautery |
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